“Measurements of what?” Sebastian said. “I’ve never fully understood the purpose of the expedition.”

“Sir Owain was developing a system for aiming big guns by the stars. He was compiling a set of tables that required observations from specific points on the globe. I didn’t understand his system then, and I don’t understand it now. And I teach navigation for a living.”

“Do go on,” Evangeline said.

Wilder said, “When we arrived at Caracas, all of his cargo was lined up on the docks and waiting for us. It took us most of a day to load. One net alone was filled with crates of fine wines and pâtés, and English cheeses soldered into tins. One crewman swore that he looked between the bars of a crate and saw a child’s playhouse and a rocking horse packed in straw. Someone came up the gangplank with a crystal chandelier, holding it up high like a birdcage. They had carpets for their tents and a fully equipped field kitchen with a French chef to go with it. A box the size of a small pantechnicon was said to contain a selection of outfits for Sir Owain’s wife. Sir Owain’s personal luggage included a mahogany gun case, which no doubt explained the two springer spaniels that we hoisted on board in a cage.”

“He took the family pets?” Sebastian said.

“His gun dogs. His plan was to shoot birds, and he had hopes of bagging a jaguar. The dogs were let out on their first night on land, and one of them didn’t return. The other one wouldn’t leave the camp after that, but within a week something had come in and taken it.”

Evangeline said, “With all that cargo, how large was the party?”

“Thirty Europeans in the main party, with a hundred and fifty Portuguese-speaking laborers set to join them for the land and river journey. As well as the guides and quartermasters he had an astronomer, a chief engineer, and a surveying team with an instrument maker to maintain and repair the survey equipment. He had a mapmaker and a botanist who doubled as the expedition’s doctor. It seemed as if Sir Owain’s plan was to overcome all challenges by simply assembling the full weight of modern civilization and driving it through them.”

“All the same,” Sebastian said. “Who’d take a woman and child into such a situation?”

“I think he took a landowner’s attitude to the world. Wherever he might care to go, he would have it tamed to his purpose like one vast country garden. He and his family would picnic in the jungle, if he so chose.”

“For most men,” Evangeline observed, “planting a flag will usually suffice.”

“We sailed along the coast to the point he’d selected for the start of the land journey. His Portuguese-speaking camaradas had a camp set up and had been waiting there for a month at half pay. They set about the unloading with eagerness, happy to break the tedium and impatient to start earning their full rate. But as the riverboats were disembarked, and the gangs of men struggled to manage the weight and the bulk of them, I could see looks being exchanged.

“Over the boats, for one. They were of a badly chosen design. The Amazon is a broad, slow river that’s easy to navigate. Its tributaries are anything but. They twist and drop through falls and rapids, and the only way to make progress is to leave the water and carry your boats and cargo down to the next calm stretch. These boats were made of steel, and very heavy. It took six men or more just to lift one.

“But there were other, more immediate problems. They faced two months of overland travel before they’d even reach the river; they had a hundred mules and fifty oxen and, most spectacular to our eyes, five huge steam cars each carrying two tons of freight.”

He shook his head, as if the memory of those great mobile machines impressed him still.

He said, “They ran on wheel-driven tracks that made short work of mud or dense foliage. But of the seven steam cars that had set out, two of them had already failed on the way.

“Without the full complement of vehicles, there was insufficient hauling power for all of the gear. We crew watched from the rail as a hasty conference was held to determine what should be taken and what left behind. Sir Owain ordered the erection of a canvas gazebo so that his wife and child might have shade. And there they sat, on drawing-room chairs in their linen and buttons and lace, waving away mosquitoes like abandoned French royalty.

“A number of boxes were finally separated out for leaving behind. These were stacked up on the shore with a net thrown over them. For all I know, they’re standing there still.

“Sir Owain and his family were to ride in a sprung observation car that was towed by one of the engines. It had a sumptuous interior and a daybed, and various private facilities. He’d designed it himself and had it constructed at the Great Western works in Swindon, and shipped it out in advance of the expedition.

“They went without a smile, a wave, or even a look back at us. The great steam cars led the way, huffing and roaring like monsters, breaking down jungle as they went, while the camaradas walked behind with the mules. The pace was such that the mules had no problem keeping up. Even when the caravan had passed from our view we were able to track their progress by the plumes from the steam cars’ smokestacks, rising above the trees. When it came time for us to leave on the next tide, their smoke was still within sight.”

Wilder took a moment. Sebastian wondered how often he thought on these images. The master’s mate seemed to have been drawn into his own tale and it was almost as if, in his mind, he was back there now. Then:

“Our orders were to sail on down the coast to the mouth of the Amazon. We were to travel up the river as far as our ship could safely navigate, and then send a boat party onward to meet the expedition at the end of its journey. I was assigned to lead the greeting party. Through circumstances outside our control, we reached the point of confluence some fifteen days late.

“It was of no matter. Sir Owain and his people had not yet appeared. The captain sent me inland to look for them. I took my men some way farther up the tributary river and we made camp at a convenient spot, where we settled down to wait.

“Days passed, and then weeks. I stopped expecting them to appear around the river’s bend at any hour and was gripped by an increasing certainty that something terrible must have happened. As our presence became known in the area, Indians came to our camp and showed us items that had washed downstream. A straw hat. Some rope. A champagne bottle with its label washed off—it had miraculously survived being smashed in the rapids.

“I sent a message back to my ship, asking what I should do. The captain’s reply came back. He said that we were being paid to wait, so I should wait. So we did.

“Finally, the survivors came floating out of the jungle on a crude raft. There were only two of them. Sir Owain, and one other. They’d been deserted by the camaradas and their boats and equipment were lost. Everyone else in the party had perished. Sir Owain’s wife and child were dead. The other man was limping on a gangrenous foot.”

Evangeline said, “Who was the other man?”

“The botanist, I think. Sir Owain was delirious and raving, and both had to be carried. We got them back to the ship as quickly as we were able, where our ship’s doctor dealt with them as best he could. Sir Owain was terribly thin but seemed physically intact, though he raved and rambled and made little sense, and eventually had to be doped and tied to his bunk.

“That was after he’d got hold of a gun from somewhere and run to the stern, blasting away at the sea and swearing that there were great serpents following us. It was a tragic sight.”

Sebastian said, “Was anything actually there?”

Wilder shook his head. “Nothing at all,” he said. “Over the next few days, Sir Owain seemed to recover. He was more or less rational by the time we reached port. As his mind cleared he asked for ink and paper and began to write furiously. Our ship’s doctor spent a lot of time with him, reading the pages as they came.”